/// <summary>
/// This API supports the Entity Framework infrastructure and is not intended to be used directly from your code.
/// </summary>
/// <returns>This API supports the Entity Framework infrastructure and is not intended to be used directly from your code.</returns>
protected override DependencyObject GetContainerForItemOverride()
{
var treeViewItem = new ExplorerTreeViewItem();
treeViewItem.Indent = Indent + 19;
return(treeViewItem);
}
internal void FocusTreeViewItem(ExplorerTreeViewItem treeViewItem)
{
if (null == treeViewItem)
{
Debug.Assert(false, "FocusTreeViewItem: should not be passed null ExplorerTreeViewItem");
return;
}
ScrollToMakeVisible(treeViewItem);
// having scrolled to the correct position, do the actual focus
Keyboard.Focus(treeViewItem);
}
internal double GetY(ExplorerTreeViewItem treeViewItem)
{
UIElement uiElement = treeViewItem;
while (uiElement != null &&
!uiElement.IsVisible)
{
uiElement = VisualTreeHelper.GetParent(uiElement) as UIElement;
}
if (uiElement == null)
{
return(0);
}
else
{
return(uiElement.TranslatePoint(new Point(0, 0), _frameContent.ExplorerTreeRoot).Y);
}
}
// Change selection for right-mouse button as well as left
private void OnTreeViewPreviewMouseDown(object sender, MouseButtonEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed ||
e.RightButton == MouseButtonState.Pressed)
{
ExplorerTreeViewItem treeViewItem = null;
var item = e.OriginalSource as UIElement;
while (item != null)
{
var toggleButton = item as ToggleButton;
if (toggleButton != null &&
toggleButton.Name == "Expander")
{
if (e.LeftButton == MouseButtonState.Pressed)
{
// have hit the expand/collapse button - so
// return without handling event here
return;
}
}
treeViewItem = item as ExplorerTreeViewItem;
if (treeViewItem != null)
{
break;
}
if (item.Focusable)
{
break;
}
item = VisualTreeHelper.GetParent(item) as UIElement;
}
if (treeViewItem != null)
{
treeViewItem.IsSelected = true;
Keyboard.Focus(treeViewItem);
if (e.LeftButton == MouseButtonState.Pressed)
{
_isTreeViewMouseDown = true;
}
}
}
}
/// <summary>
/// Get the immediate children of the current ExplorerTreeViewItem, create automation peers for them, and return them for
/// accessibility/automation
/// </summary>
/// <param name="parent"></param>
/// <returns></returns>
private static List<AutomationPeer> GetAutomationChildren(ExplorerTreeViewItem parent)
{
var automationChildren = new List<AutomationPeer>();
foreach (ExplorerEFElement element in parent.Items)
{
// get the TreeViewItem from the explorer element.
var treeViewItem = parent.ItemContainerGenerator.ContainerFromItem(element) as ExplorerTreeViewItem;
if (treeViewItem != null)
{
// create an AutomationPeer for this TreeViewItem (will call OnCreateAutomationPeer) and add that to the list to return
var automationChild = CreatePeerForElement(treeViewItem);
Debug.Assert(automationChild != null, "Every ExplorerTreeViewItem should have an automation peer");
if (automationChild != null)
{
automationChildren.Add(automationChild);
}
}
}
return automationChildren;
}
internal void ScrollToMakeVisible(ExplorerTreeViewItem treeViewItem)
{
if (null == treeViewItem)
{
Debug.Assert(false, "ScrollToMakeVisible: should not be passed null ExplorerTreeViewItem");
return;
}
// select item and scroll so that it is visible
treeViewItem.IsSelected = true;
if (ScrollViewer != null)
{
var y = GetY(treeViewItem);
var viewPortHeight = ScrollViewer.ViewportHeight;
if (Math.Abs(ScrollViewer.VerticalOffset + viewPortHeight / 2 - y) > viewPortHeight / 2)
{
// bring to view and center vertically
ScrollViewer.ScrollToVerticalOffset(y - viewPortHeight / 2);
}
var partHeader = ExplorerUtility.GetTreeViewItemPartHeader(treeViewItem);
if (partHeader != null)
{
// bring to view horizontally and maximize visible width
var x = partHeader.TranslatePoint(new Point(0, 0), ExplorerTreeRoot).X;
var width = partHeader.DesiredSize.Width;
var viewPortWidth = ScrollViewer.ViewportWidth;
var horizontalOffset = ScrollViewer.HorizontalOffset;
if ((horizontalOffset > x) ||
((x + width) > (horizontalOffset + viewPortWidth)))
{
ScrollViewer.ScrollToHorizontalOffset(x);
}
}
}
}
public ExplorerTreeViewItemAutomationPeer(ExplorerTreeViewItem owner)
: base(owner)
{
}
internal void ScrollToMakeVisible(ExplorerTreeViewItem treeViewItem)
{
if (null == treeViewItem)
{
Debug.Assert(false, "ScrollToMakeVisible: should not be passed null ExplorerTreeViewItem");
return;
}
// select item and scroll so that it is visible
treeViewItem.IsSelected = true;
if (ScrollViewer != null)
{
var y = GetY(treeViewItem);
var viewPortHeight = ScrollViewer.ViewportHeight;
if (Math.Abs(ScrollViewer.VerticalOffset + viewPortHeight / 2 - y) > viewPortHeight / 2)
{
// bring to view and center vertically
ScrollViewer.ScrollToVerticalOffset(y - viewPortHeight / 2);
}
var partHeader = ExplorerUtility.GetTreeViewItemPartHeader(treeViewItem);
if (partHeader != null)
{
// bring to view horizontally and maximize visible width
var x = partHeader.TranslatePoint(new Point(0, 0), ExplorerTreeRoot).X;
var width = partHeader.DesiredSize.Width;
var viewPortWidth = ScrollViewer.ViewportWidth;
var horizontalOffset = ScrollViewer.HorizontalOffset;
if ((horizontalOffset > x)
|| ((x + width) > (horizontalOffset + viewPortWidth)))
{
ScrollViewer.ScrollToHorizontalOffset(x);
}
}
}
}
internal void FocusTreeViewItem(ExplorerTreeViewItem treeViewItem)
{
if (null == treeViewItem)
{
Debug.Assert(false, "FocusTreeViewItem: should not be passed null ExplorerTreeViewItem");
return;
}
ScrollToMakeVisible(treeViewItem);
// having scrolled to the correct position, do the actual focus
Keyboard.Focus(treeViewItem);
}
internal double GetY(ExplorerTreeViewItem treeViewItem)
{
UIElement uiElement = treeViewItem;
while (uiElement != null
&& !uiElement.IsVisible)
{
uiElement = VisualTreeHelper.GetParent(uiElement) as UIElement;
}
if (uiElement == null)
{
return 0;
}
else
{
return uiElement.TranslatePoint(new Point(0, 0), _frameContent.ExplorerTreeRoot).Y;
}
}
public ExplorerTreeViewItemAutomationPeer(ExplorerTreeViewItem owner)
: base(owner)
{
}
/// <summary>
/// This API supports the Entity Framework infrastructure and is not intended to be used directly from your code.
/// </summary>
/// <returns>This API supports the Entity Framework infrastructure and is not intended to be used directly from your code.</returns>
protected override DependencyObject GetContainerForItemOverride()
{
var treeViewItem = new ExplorerTreeViewItem();
treeViewItem.Indent = Indent + 19;
return treeViewItem;
}
